Chamberlain 3280-267C, 3280C Connect Door Arm to Trolley, Figure, Figure, Figure, •Figure 1:, •Figure 2:, SECTIONAL DOORS ONLY, •Figure 3, Hole alignment alternative:

INSTALLATION STEP 12

Connect Door Arm to Trolley

Follow instructions which apply to your door type as illustrated below and on the following page.

SECTIONAL DOORS ONLY

•Make sure garage door is fully closed. Pull the emergency release handle to disconnect the outer trolley from the inner trolley. Slide the outer trolley back (away from the door) about 2" (5 cm) as shown in Figures 1, 2 and 3.

•Figure 1:

–Fasten straight door arm section to outer trolley with the 5/16"x1" clevis pin. Secure the connection with a ring fastener.

–Fasten curved section to the door bracket in the same way, using the 5/16"x1-1/4" clevis pin.

•Figure 2:

–Bring arm sections together. Find two pairs of holes that line up and join sections. Select holes as far apart as possible to increase door arm rigidity.

•Figure 3, Hole alignment alternative:

–If holes in curved arm are above holes in straight arm, disconnect straight arm. Cut about 6"

(15 cm) from the solid end. Reconnect to trolley with cut end down as shown.

–Bring arm sections together.

–Find two pairs of holes that line up and join with bolts, lock washers and nuts.

•Pull the emergency release handle toward the opener at a 45° angle so that the trolley release arm is horizontal. Proceed to Adjustment Step 1, page 23. Trolley will re-engage automatically when opener is operated.

HARDWARE SHOWN ACTUAL SIZE

Nut 5/16"-18 Lock Washer 5/16" Ring Fastener

	Clevis Pin	Hex Bolt
Clevis Pin
5/16"x1" (Trolley)	5/16"x1-1/4" (Door Bracket)	5/16"-18x7/8"

Inner Trolley

Outer Trolley

Clevis Pin

Ring5/16"x1"

Fastener

Door
Bracket	Straight
	Door Arm

	Curved
	Door Arm
	Clevis Pin
Figure 1	5/16"x1-1/4"

Lock Washers 5/16"

Nuts	Emergency
5/16"-18
	Release
	Handle

Bolts 5/16"-18x7/8"

Door Bracket

Figure 2

Lock Washers 5/16"

Nuts 5/16"-18

Bolts 5/16"-18x7/8"

Cut This End

Figure 3

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